JOHN was buried 11 Jan 1848 age 71 (1777)
As John does not appear on 1851 his pob in Norfolk is not conclusively known.
If born circa 1776/7...
Foulden is next door to Northwold, so a possibility might be the John baptized there 13 July 1777 to William and Elizabeth Reeve?
(possibly they are the William Reve and Elizabeth Sharwood who married 15 Jan 1771, same place?)
PR here with that baptism
https://www.familysearch.org/ark:/61903/3:1:S3HY-DRX3-PTD?i=3&cc=1416598First son to John and Mary at Northwold is William in 1804
Wm son of John Reeves + Mary his wife late Mary Towler was born Feb 17 and Rec'd into Church March 18 1804
There was also a Robert Reeve bap at Foulden to William and Elizabeth in 1781
A Robert Reeve and wife Susan (Reed) were having children baptized at Northwold at the same time as John and Mary, and they were all in the hamlet of Whittington, certainly in the later period.
But John and Mary didn't have a son Robert

Just an idea, something to investigate perhaps!